19 weeks pregnant: what is happening this week

15.3 cm, described by the NHS as roughly a beef tomato, and this is the last week the measurement means what it has meant so far. Adult teeth are forming behind the first set, which will not be needed for six years or so. Weight is going on steadily now. Bubbling sensations that could plausibly be movement are becoming harder to attribute to anything else. Ligaments have loosened enough that running and similar exercise can feel unstable, which is a mechanical change rather than a limit anyone has imposed. Halfway is next week, and the halfway point is a strange one emotionally. There is often less to report than in the first trimester and less urgency than in the third, and it can feel like a plateau. It is not. This is the stretch where sleep is still possible, work is still manageable, and decisions that will be hard to make later - childcare, leave dates, where the baby will sleep - can be made calmly. The people who find weeks 30 onwards least stressful are almost always the ones who used weeks 19 to 25 for something other than waiting.